CN203749648U

CN203749648U - Prosthesis for partial femoral head replacement

Info

Publication number: CN203749648U
Application number: CN201420126311.8U
Authority: CN
Inventors: 郭万首; 张启栋
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-03-20
Filing date: 2014-03-20
Publication date: 2014-08-06
Anticipated expiration: 2024-03-20

Abstract

The utility model discloses a prosthesis for partial femoral head replacement. By the adoption of the prosthesis for partial femoral head replacement, nidus can be removed, lateral columns of the femoral head can be reestablished, and the integrity of a load-bearing area of the femoral head can be recovered. According to the technical scheme, the prosthesis for partial femoral head replacement comprises a spherical crown and a dead bolt, a part of the spherical crown is spherical, the spherical crown can play a role in recovering the spherical joint surface of the femoral head, the prosthesis for partial femoral head replacement is inserted into the femoral head through the fixing bolt, and the fixing bolt can fix the prosthesis for partial femoral head replacement. By the adoption of the prosthesis for partial femoral head replacement, a part of a collapsed area of a patient suffering from femoral head necrosis can be repaired, nidus can be removed, the femoral head can be repaired, the smooth joint surface of the femoral head can be reestablished, and implementation is easy.

Description

Part femoral head replacement prosthese

Technical field

This utility model relates to a kind of artificial prosthesis for the treatment of femur head necrosis, specifically, relates to a kind of for carrying out the artificial prosthesis of part femoral head replacement.

Background technology

Femur head necrosis is orthopaedics commonly encountered diseases, difficult disease, is the common cause that person between twenty and fifty are disabled.It is reported have 300,000～600,000 at U.S.'s Patients with Aseptic Necrosis of Femoral, the number of the annual new femur head necrosis of China is between 15～300,000, and accumulative total needs treatment number between 5,000,000～7,500,000.Femur head necrosis morbidity is early stage, can adopt core decompression, rotary osteotomy, with or without the method treatments such as bone transplanting of blood vessel, to postpone or to avoid replacement of total hip.But unfortunately, a lot of patients can not get early diagnosis, more can not get appropriate treatment, subside rapidly thereby there is femoral head, articular surface out-of-flatness, osteoarthritis secondary, causes pain and dysfunction.Because femur head necrosis is multiple in the young and the middle aged, lesion growth arrives middle and advanced stage, especially young ARCO III phase patient, face two awkward conditions, if take femoral head to protect head treatment, poor effect, not only affect patients ' life quality, and delay later stage functional rehabilitation; If take replacement of total hip, operation wound is large, and bone loss is many, if the large and poor effect of difficulty while again reprocessing.For young ARCO III option share head necrosis, retain femoral head, preserve bone amount, delay the age of replacement of total hip, for replacement of total hip gains time, seem particularly important.Beijing China-Japan Friendship Hospital is on the basis of 5000 many cases femur head necrosis clinic diagnosis practices, and atraumatic femur head necrosis " mixed lateral column " theory first proposing has also been set up China-Japan Friendship Hospital's typing.Femur head necrosis is subsided has much relations with femoral head mixed lateral column, and femur head necrosis is involved the patient of mixed lateral column, there will be very soon articular step-off osteoarthritis secondary, protects a therapeutic effect not good.The mixed lateral column person of existence, subsiding does not appear in 95% patient joint, and function of joint is preserved good.Therefore, the reconstruction of mixed lateral column is the joint part of femoral head necrosis therapeutic.Secondly, the telotism in joint needs complete articular surface as basis.The round and smooth articular surface of femoral head of how rebuilding after subsiding is treatment ARCOIII phase patient's key point.On the basis of this theory, how for mixed lateral column, to rebuild, actively innovation improves becomes this area technical problem anxious to be resolved.

Utility model content

This utility model aims to provide a kind ofly can remove focus, rebuild femoral head mixed lateral column, recover the part femoral head replacement prosthese of femoral head at weight loading region integrity, this prosthese can not only play to repair rebuilds femur head necrosis defective region, and can rebuild femoral head articular surface, recover femoral head shape, keep articular surface smooth, retain capital natural motion function.

To achieve these goals, the technical scheme that this utility model part femoral head replacement prosthese adopts is: described part femoral head replacement prosthese is comprised of spherical crown and gim peg two parts, described spherical crown is part spheroid, spherical crown upper surface is smooth sphere, lower surface is circular flat, at spherical crown lower surface middle part, is provided with a gim peg; Described gim peg is conical design, and gim peg surface is provided with screw thread, gim peg length 5-30mm, and major diameter of thread 2-20mm, described screw thread is single thread or multi start thread.This utility model part femoral head replacement prosthetic material adopts the alloys such as cobalt chrome molybdenum, titanium, has both ensured some strength, guarantees again certain toughness, wearability.This utility model part femoral head replacement prosthese is only that replace in mixed lateral column region to femur head necrosis kitchen range region, and it accounts for femoral head surface area and is no more than 1/2nd.The useful effect of this utility model part femoral head replacement prosthese is, can rebuild articular surface simultaneously removing femoral head focus, retain as far as possible again femoral head, is that young patient is preserved bone amount, and wound is little, easy to implement.

Accompanying drawing explanation

The Figure of description that forms the application's a part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model is used for explaining this utility model, does not form improper restriction of the present utility model.In the accompanying drawings:

Fig. 1 is the schematic diagram of this utility model part femoral head replacement prosthese multi start thread embodiment;

Fig. 2 is the schematic diagram of this utility model part femoral head replacement prosthese single thread embodiment;

Fig. 3 is this utility model part femoral head replacement prosthese embodiment using state schematic diagram.

The specific embodiment

As shown in Figure 1 and Figure 2, this utility model part femoral head replacement prosthese is comprised of spherical crown 1 and gim peg 2 two parts, and spherical crown 1 is positioned at top, and described spherical crown 1 upper surface is smooth sphere 11, described smooth sphere 11 its spherical diameter 20-60mm; Under spherical crown 1, surface 12 is planar design, lower surface 12 middle parts are provided with gim peg 2, described gim peg 2 is conical design, gim peg 2 surfaces are provided with screw thread 21, gim peg 2 length 5-30mm, screw thread 21 external diameter 2-20mm, described screw thread 21 is single thread or multi start thread, described multi start thread line quantity 2-8.During use, first patient removes patient's femoral head focus, be modified to flat surfaces, according to measurement, select the part femoral head replacement prosthese mating with host's femoral head, requirement can be accomplished articular surface smooth excessiveness, recover femoral head ball shape, then gim peg 2 is inserted or screws in host's femoral head, between part femoral head replacement prosthese and host's femoral head, available bone cement is fixed to rebuild mixed lateral column, reinvents femoral head articular surface.Described part femoral head replacement prosthese adopts vitallium to make.

The foregoing is only preferred embodiment of the present utility model and oneself, be not limited to this utility model, for a person skilled in the art, this utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims

1. a part femoral head replacement prosthese, it is characterized in that: this utility model part femoral head replacement prosthese is comprised of spherical crown (1) and gim peg (2) two parts, described spherical crown (1) upper surface is smooth sphere (11), and its spherical diameter of described smooth sphere (11) is 20-60mm; Under spherical crown (1), surface (12) is planar design, and lower surface (12) middle part is provided with gim peg (2), and described gim peg (2) is conical design.

2. part femoral head replacement prosthese according to claim 1, it is characterized in that, described gim peg (2) surface is provided with screw thread (21), gim peg 2 length 5-30mm, described screw thread (21) external diameter 2-20mm, described screw thread (21) is single thread or multi start thread, described multi start thread line quantity 2-8.

3. part femoral head replacement prosthese according to claim 1, is characterized in that, the position that spherical crown (1) contacts with lower limb with gim peg (2) adopts vitallium to make.